There is an MPX-50, MPX-60, and now an MPX-70.
I have heard from people with the 50 and 60 that the output from the 50 is better. The 70 used stylus packs of carbon filament. Ewen one gets dull you switch to the next. The packs are expensive on a per piece basis. I forgot how many impacts they quoted for each stylus, but it takes about 80,000 per dog tag, and the life was not good. Then again the quality diminishes as they wear so when it gets to replacement time the quality gets near unacceptable. I far prefer the diamond tip with the 50 and 60.
One other thing, you do not find the 50 on Ebay, that says something.
Philadelphia, PA (Really Bensalem)
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